Table 2.
Spearman rank correlations between uremic retention solutes
| Urea | Creatinine | IS, Total | IS, Free | IS, f | pCS, Total | pCS, Free | pCS, f | |
|---|---|---|---|---|---|---|---|---|
| Urea | 1.00 | — | — | — | — | — | — | — |
| Creatinine | r = 0.37, P = 0.002 | 1.00 | — | — | — | — | — | — |
| Indoxyl sulfate, total | r = 0.30, P = 0.01 | r = 0.47, P < 0.001 | 1.00 | — | — | — | — | — |
| Indoxyl sulfate, free | r = 0.38, P = 0.001 | r = 0.37, P = 0.001 | r = 0.81, P < 0.001 | 1.00 | — | — | — | — |
| Indoxyl sulfate, f | r = 0.33, P = 0.005 | r = 0.13, P = 0.3 | r = 0.3, P = 0.02 | r = 0.73, P < 0.001 | 1.00 | — | ||
| p-cresyl sulfate, total | r = 0.21, P = 0.08 | r = 0.21, P = 0.08 | r = 0.02, P = 0.9 | r = 0.30, P = 0.01 | r = 0.56, P = < 0.001 | 1.00 | — | — |
| p-cresyl sulfate, free | r = 0.28, P = 0.02 | r = 0.21, P = 0.08 | r = 0.15, P = 0.20 | r = 0.54, P < 0.001 | r = 0.76, P < 0.001 | r = 0.93, P < 0.001 | 1.00 | — |
| p-cresyl sulfate, f | r = 0.38, P = 0.001 | r = 0.27, P = 0.03 | r = 0.44, P < 0.001 | r = 0.54, P < 0.001 | r = 0.92, P < 0.001 | r = 0.62, P < 0.001 | r = 0.84, P < 0.001 | 1.00 |
IS, indoxyl sulfate; pCS, p-cresyl sulfate; f, free fraction.